1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // soc-apci.c - support for ACPI enumeration.
4 //
5 // Copyright (c) 2013-15, Intel Corporation.
6
7 #include <linux/export.h>
8 #include <linux/module.h>
9 #include <sound/soc-acpi.h>
10
snd_soc_acpi_id_present(struct snd_soc_acpi_mach * machine)11 static bool snd_soc_acpi_id_present(struct snd_soc_acpi_mach *machine)
12 {
13 const struct snd_soc_acpi_codecs *comp_ids = machine->comp_ids;
14 int i;
15
16 if (machine->id[0]) {
17 if (acpi_dev_present(machine->id, NULL, -1))
18 return true;
19 }
20
21 if (comp_ids) {
22 for (i = 0; i < comp_ids->num_codecs; i++) {
23 if (acpi_dev_present(comp_ids->codecs[i], NULL, -1)) {
24 strscpy(machine->id, comp_ids->codecs[i], ACPI_ID_LEN);
25 return true;
26 }
27 }
28 }
29
30 return false;
31 }
32
33 struct snd_soc_acpi_mach *
snd_soc_acpi_find_machine(struct snd_soc_acpi_mach * machines)34 snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
35 {
36 struct snd_soc_acpi_mach *mach;
37 struct snd_soc_acpi_mach *mach_alt;
38
39 for (mach = machines; mach->id[0] || mach->comp_ids; mach++) {
40 if (snd_soc_acpi_id_present(mach)) {
41 if (mach->machine_quirk) {
42 mach_alt = mach->machine_quirk(mach);
43 if (!mach_alt)
44 continue; /* not full match, ignore */
45 mach = mach_alt;
46 }
47
48 return mach;
49 }
50 }
51 return NULL;
52 }
53 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
54
snd_soc_acpi_find_package(acpi_handle handle,u32 level,void * context,void ** ret)55 static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
56 void *context, void **ret)
57 {
58 struct acpi_device *adev;
59 acpi_status status;
60 struct snd_soc_acpi_package_context *pkg_ctx = context;
61
62 pkg_ctx->data_valid = false;
63
64 if (acpi_bus_get_device(handle, &adev))
65 return AE_OK;
66
67 if (adev->status.present && adev->status.functional) {
68 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
69 union acpi_object *myobj = NULL;
70
71 status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
72 NULL, &buffer,
73 ACPI_TYPE_PACKAGE);
74 if (ACPI_FAILURE(status))
75 return AE_OK;
76
77 myobj = buffer.pointer;
78 if (!myobj || myobj->package.count != pkg_ctx->length) {
79 kfree(buffer.pointer);
80 return AE_OK;
81 }
82
83 status = acpi_extract_package(myobj,
84 pkg_ctx->format, pkg_ctx->state);
85 if (ACPI_FAILURE(status)) {
86 kfree(buffer.pointer);
87 return AE_OK;
88 }
89
90 kfree(buffer.pointer);
91 pkg_ctx->data_valid = true;
92 return AE_CTRL_TERMINATE;
93 }
94
95 return AE_OK;
96 }
97
snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],struct snd_soc_acpi_package_context * ctx)98 bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
99 struct snd_soc_acpi_package_context *ctx)
100 {
101 acpi_status status;
102
103 status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
104
105 if (ACPI_FAILURE(status) || !ctx->data_valid)
106 return false;
107
108 return true;
109 }
110 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
111
snd_soc_acpi_codec_list(void * arg)112 struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
113 {
114 struct snd_soc_acpi_mach *mach = arg;
115 struct snd_soc_acpi_codecs *codec_list =
116 (struct snd_soc_acpi_codecs *) mach->quirk_data;
117 int i;
118
119 if (mach->quirk_data == NULL)
120 return mach;
121
122 for (i = 0; i < codec_list->num_codecs; i++) {
123 if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
124 return NULL;
125 }
126
127 return mach;
128 }
129 EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
130
131 MODULE_LICENSE("GPL v2");
132 MODULE_DESCRIPTION("ALSA SoC ACPI module");
133